Add --rebuild flag to force rebuilding the image

Currently, `rails-new` must be released to use any newly released
versions of Ruby/Rails by default. To address this, I'd like to remove
the fallback versions of Ruby/Rails in the CLI arguments. However, this
will mean that the image name no longer contains the Rails version, and
that can lead to a stale Rails version when running `rails-new` if it
has been previously built.

This commit addresses that by providing a `--rebuild` option which
forces the container to be rebuilt and ensures the latest version of
Rails is installed and used.

Author: skipkayhil

src/docker_client.rs

@@ -8,11 +8,16 @@ impl DockerClient {
         rails_version: &str,
         user_id: Option<u32>,
         group_id: Option<u32>,
+        rebuild: bool,
     ) -> Command {
         let mut command = Command::new("docker");
 
         command.arg("build");
 
+        if rebuild {
+            command.arg("--no-cache");
+        }
+
         Self::set_build_arg(&mut command, "RUBY_VERSION", ruby_version);
         Self::set_build_arg(&mut command, "RAILS_VERSION", rails_version);
 
@@ -116,7 +121,7 @@ mod tests {
 
     #[test]
     fn build_image() {
-        let command = DockerClient::build_image("3.2.3", "7.1.3", None, None);
+        let command = DockerClient::build_image("3.2.3", "7.1.3", None, None, false);
 
         assert_eq!(command.get_program(), "docker");
 
@@ -139,7 +144,7 @@ mod tests {
 
     #[test]
     fn build_image_with_user_id() {
-        let command = DockerClient::build_image("3.2.3", "7.1.3", Some(1000), None);
+        let command = DockerClient::build_image("3.2.3", "7.1.3", Some(1000), None, false);
 
         assert_eq!(command.get_program(), "docker");
 
@@ -164,7 +169,7 @@ mod tests {
 
     #[test]
     fn build_image_with_group_id() {
-        let command = DockerClient::build_image("3.2.3", "7.1.3", None, Some(1000));
+        let command = DockerClient::build_image("3.2.3", "7.1.3", None, Some(1000), false);
 
         assert_eq!(command.get_program(), "docker");
 

src/main.rs

@@ -19,6 +19,7 @@ fn main() {
 
     let ruby_version = cli.ruby_version;
     let rails_version = cli.rails_version;
+    let rebuild = cli.rebuild;
 
     // Run docker build --build-arg RUBY_VERSION=$RUBY_VERSION --build-arg RAILS_VERSION=$RAILS_VERSION -t rails-new-$RUBY_VERSION-$RAILS_VERSION
     // passing the content of DOCKERFILE to the command stdin
@@ -27,6 +28,7 @@ fn main() {
         &rails_version,
         os_specific::get_user_id(),
         os_specific::get_group_id(),
+        rebuild,
     )
     .spawn()
     .expect("Failed to execute process");

src/rails_new.rs

@@ -10,6 +10,8 @@ pub struct Cli {
     pub ruby_version: String,
     #[clap(long, short = 'r', default_value = "8.0.1")]
     pub rails_version: String,
+    #[clap(long)]
+    pub rebuild: bool,
 
     #[command(subcommand)]
     pub command: Option<Commands>,